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AN4240 Folha de dados(PDF) 21 Page - STMicroelectronics

Nome de Peças AN4240
Descrição Electrónicos  This application note provides an easy introduction to the usage
PDF  30 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4240 Folha de dados(HTML) 21 Page - STMicroelectronics

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Doc ID024209 Rev 2
21/30
AN4240
Application demo results
6
Application demo results
To better understand the differences between the two cipher modes the following figures will
show an ECB encryption and a CBC encryption starting from the same image:
Figure 16. Demo Starting point
Figure 16 shows that the ECB encryption should not be suggested for encryption of
message with a low variance because, for the same nature of the algorithm, identical
plaintext blocks of messages are encrypted into identical ciphertext blocks. This does not
hide the data pattern well. In some sense it does not provide a high level of confidentiality
and security.



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